Adjuster for oil-well pumps



No Model.) r 2 sheets-sheet 1.

S. R. DRESSER.

ADJUSTER FOR OIL WELL PUMPS.

No. 255,151. Patented Mar. 21,1882.

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s. R. DRESSER. 7 ADJUSTER FOR OIL WELL PUMPSv No. 255,151 Patented Mar. 21,1882.

UNITED STATES PATENT OFFICE.

SOLOMON R. DRESSER, OF BRADFORD, PENNSYLVANIA.

ADJUSTER FOR OIL-WELL PUMPS.

SPECIFICATION formingpart of Letters Patent No; 255,151, dated March 21, 1882.

' Application filed January 2-1, 1882. (No model.)

To all whom tt may concern .Be it known that I, SOLOMON R. Danssaa, a citizen of the United States, residing at Bradford, in the county of McKean and State of Pennsylvania, have invented certain new and useful Improvements in Adjusters for Oil-Well Pumps; and I do hereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification. V

My invention relates to devices for adjusting polish-rods used in pumping oil-wells.

The nature of my invention consists of parts and combination of parts, as will hereinafter be set forth and claimed.

In the drawings, Figure 1 represents an adjuster in perspective, with the jaws spread to show the clamping-faces, bolt,and slots; Fig. 2, a horizontal section through the clampingjaws just above the nuts and in the same plane as the top of the set-screw; Fig. 3, a detail view, showing the head of the bolt resting upon a ledge formed upon one of the clampingjaws. I

A represents an adjuster, having trunnions B, neck B, hinged clamping-jaws O 0, bolt D, nuts d, and set-screw F. The trunnions B, neck B, and clamping-jaw O are preferably cast in one piece, although jaw 0 may be attached in any suitable manner. The contour of these par-ts and jaw 0 may be as desired. The form shown, however, is the one preferred. The clamping-jaws are hinged atI, as shown. The stationary or rigid jaw O is provided with a semicircular vertical depression, c,which registers with a corresponding depression, 0, in jaw O, forming a vertical opening, into which the polish-rod is inserted. This opening 0 c is placed in such a position that when the polishrod is inserted the latter passes downjust in front of the neck. To the rear of opening 0 0, about midway the length of thejaws, andjust above 'the neck, are two holes, 0 and c,'located respectively in jaws O and O. The hole 0' is of the ordinary form. Hole 0, however, is of an oval shape, having its greatest diameter extending lengthwise of thej 1w, for a pur pose that will hereinafter be described. A bolt, D, is inserted through these openings, and serves to clamp the jaws by means of nuts (1 d, placed upon its free end outside ofjaw G. The head (1 is rigidly attached to the bolt, and when inserted through holes 0 o rests upon a ledge, 01, (shown in Fig. 3 and in dotted lines, Fig. 2,) and which is cast upon the side OfJlBCk B and clamp O. The object of this ledge is to prevent the bolt-head from being turned when the nuts are screwed down against the outer face of thejaw G.

I am aware that it is old to countersink the heads of bolts for a similar purpose in other de vices, and to that I make no claim. My device, however, ditlers from that form, in that while the countersink takes part of the metal away and weakens the body, mine adds to and strengthens the neck and clamp.

The operation is as follows: Suppose the parts to be in the position shown in Fig. 2, and it is desired to clamp a polish-rod between the jaws. It will only be necessary to partly withdraw bolt D and close the movablejaw until bolt D rests in the front end of the movable slot or hole in jaw G. The polish-rod should now be inserted between the gaping jaws until it reaches depression 0 and c. The movable jaw is then pressed against the otherjaw, the bolt slides in the oval hole as the jaw is moved, and the depression 0 c closes around the polish-rod. Nut 11 is screwed upon bolt D, forcing the movable jaw against the rod, which in turn is forced againstjaw G. A second nut, d, is now screwed against nut 61' to preventthelatterfrom slipping. Theset-screw is now screwed against the rod and assists in holding the latter in place. If desired, screw threads may be out in hole 0 c and corresponding threads out upon the polish-rod, so that when only a slight adjustment is necessary the rod can be turned without removing the clamp ing device. These screw-threads can be used instead of the set-screw for holding the rod in place.

Whenever it is desired to remove the rod it is only necessary to remove or loosen the bolt, and the rod can be taken out laterally without disturbing the position of the adjuster.

The advantage of having the bolt in the rear of the clam ping-surfaces is manifest.

I am aware that rope-sockets have been made of two hinged jaws having clamping-faces and a screw-threaded pin placed between the hinge andelamping-faces, and to this I make no claim, as that device differs from minein that one of my clamping-jaws is formed integral with the trunnions, and both are held in place by a headed bolt and nuts. Therefore What I claim as new is- 1. An adjuster having two clamping-jaws, one of which is formed integral with the trunnions, and both hinged together and provided with clamping faces held together by a bolt and nut placed between the hinge and clamping-faces.

2. An adjuster having two clamping-jaws, one of which is formed integral with the trunnions, and both hinged together and provided with clamping-faces having a device for holdiug the rod therein, and a bolt and nut for bolding, the jaws together.

8. In an adjuster, a movablejaw having an oral hole, for the purpose set forth, in combination with a fixed jaw having a clamping-bolt, substantially as described.

4. In an adjuster, a clamping-bolt having its head seated upon a ledge formed upon one of the clamping-jaws, as and for the purpose set forth. I

In testimony whereofl aflix my signature in presence of two witnesses.

SOLOMON It. DRESSER.

Witnesses:

JOHN K. ROBINSON, G. A. N EA'LE. 

